UIViewとCALayerの階層構造 - Qiita

UIViewとCALayerを複数重ねたときの順番でハマったのでメモ。 UIViewとCALayerを用意する import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let viewA = UIView() viewA.frame = CGRect(x: 30, y: 100, width: 100, height: 100) viewA.backgroundColor = UIColor.blue let viewB = UIView() viewB.frame = CGRect(x: 50, y: 50, width: 100, height: 100) viewB.backgroundColor = UIColor.red let